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  1. Minecraft: Java Edition
  2. MC-181833

Crash on world startup after playing world in 20w18a

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: 20w18a
    • Fix Version/s: 1.16 Release Candidate 1
    • Labels:
      None
    • Confirmation Status:
      Unconfirmed
    • Category:
      Crash

      Description

      The Bug

      After playing on my test world in 20w18a, exiting it, and joining again, it now crashes on startup.

      My worldfile: https://www.dropbox.com/s/zxry677t6t4zlv3/Testwelt.zip?dl=0

      I also noticed nullpointer exceptions when trying to save chunks in the launcher log: 2020-05-01-2.log

      ---- Minecraft Crash Report ----
      // Shall we play a game?
      
      Time: 01.05.20 00:20
      Description: Ticking memory connection
      
      java.lang.NullPointerException: Ticking memory connection
      	at ms$a$$Lambda$3061/55543660.apply(Unknown Source)
      	at ms$a.a(SourceFile:346)
      	at ms.b(SourceFile:108)
      	at my$a.a(SourceFile:460)
      	at my$a.serialize(SourceFile:330)
      	at com.google.gson.internal.bind.TreeTypeAdapter.write(TreeTypeAdapter.java:81)
      	at com.google.gson.Gson.toJson(Gson.java:669)
      	at com.google.gson.Gson.toJsonTree(Gson.java:562)
      	at com.google.gson.Gson.toJsonTree(Gson.java:541)
      	at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.serialize(TreeTypeAdapter.java:155)
      	at mp$b.a(SourceFile:260)
      	at mp$b.a(SourceFile:275)
      	at mp$b.a(SourceFile:282)
      	at mp$b.a(SourceFile:282)
      	at mp$b.serialize(SourceFile:132)
      	at com.google.gson.internal.bind.TreeTypeAdapter.write(TreeTypeAdapter.java:81)
      	at com.google.gson.Gson.toJson(Gson.java:669)
      	at com.google.gson.Gson.toJson(Gson.java:648)
      	at com.google.gson.Gson.toJson(Gson.java:603)
      	at com.google.gson.Gson.toJson(Gson.java:583)
      	at mp$b.a(SourceFile:343)
      	at cdh.a(SourceFile:46)
      	at cdh.b(SourceFile:102)
      	at or.<init>(SourceFile:71)
      	at yf.a(SourceFile:1096)
      	at yf.a(SourceFile:780)
      	at yf.a(SourceFile:903)
      	at yf.a(SourceFile:1029)
      	at yr.c(SourceFile:472)
      	at yt.m(SourceFile:870)
      	at yt.f(SourceFile:785)
      	at yt.c(SourceFile:764)
      	at abe.a(SourceFile:192)
      	at zn.c(SourceFile:111)
      	at zn.b(SourceFile:63)
      	at mc.a(SourceFile:230)
      	at zk.c(SourceFile:171)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:912)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:839)
      	at enx.a(SourceFile:89)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:698)
      	at java.lang.Thread.run(Thread.java:745)
      
      
      A detailed walkthrough of the error, its code path and all known details is as follows:
      ---------------------------------------------------------------------------------------
      
      -- Head --
      Thread: Server thread
      Stacktrace:
      	at ms$a$$Lambda$3061/55543660.apply(Unknown Source)
      	at ms$a.a(SourceFile:346)
      	at ms.b(SourceFile:108)
      	at my$a.a(SourceFile:460)
      	at my$a.serialize(SourceFile:330)
      	at com.google.gson.internal.bind.TreeTypeAdapter.write(TreeTypeAdapter.java:81)
      	at com.google.gson.Gson.toJson(Gson.java:669)
      	at com.google.gson.Gson.toJsonTree(Gson.java:562)
      	at com.google.gson.Gson.toJsonTree(Gson.java:541)
      	at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.serialize(TreeTypeAdapter.java:155)
      	at mp$b.a(SourceFile:260)
      	at mp$b.a(SourceFile:275)
      	at mp$b.a(SourceFile:282)
      	at mp$b.a(SourceFile:282)
      	at mp$b.serialize(SourceFile:132)
      	at com.google.gson.internal.bind.TreeTypeAdapter.write(TreeTypeAdapter.java:81)
      	at com.google.gson.Gson.toJson(Gson.java:669)
      	at com.google.gson.Gson.toJson(Gson.java:648)
      	at com.google.gson.Gson.toJson(Gson.java:603)
      	at com.google.gson.Gson.toJson(Gson.java:583)
      	at mp$b.a(SourceFile:343)
      	at cdh.a(SourceFile:46)
      	at cdh.b(SourceFile:102)
      	at or.<init>(SourceFile:71)
      	at yf.a(SourceFile:1096)
      	at yf.a(SourceFile:780)
      	at yf.a(SourceFile:903)
      	at yf.a(SourceFile:1029)
      	at yr.c(SourceFile:472)
      	at yt.m(SourceFile:870)
      	at yt.f(SourceFile:785)
      	at yt.c(SourceFile:764)
      	at abe.a(SourceFile:192)
      	at zn.c(SourceFile:111)
      	at zn.b(SourceFile:63)
      	at mc.a(SourceFile:230)
      
      -- Ticking connection --
      Details:
      	Connection: mc@4c2bae42
      Stacktrace:
      	at zk.c(SourceFile:171)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:912)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:839)
      	at enx.a(SourceFile:89)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:698)
      	at java.lang.Thread.run(Thread.java:745)
      
      -- System Details --
      Details:
      	Minecraft Version: 20w18a
      	Minecraft Version ID: 20w18a
      	Operating System: Windows 10 (amd64) version 10.0
      	Java Version: 1.8.0_51, Oracle Corporation
      	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
      	Memory: 2242910264 bytes (2139 MB) / 3791650816 bytes (3616 MB) up to 4294967296 bytes (4096 MB)
      	CPUs: 4
      	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4096M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
      	Player Count: 1 / 8; [yu['NeunEinser'/4604, l='ServerLevel[Testwelt]', x=-1644.90, y=56.00, z=-945.50]]
      	Data Packs: vanilla
      	Type: Integrated Server (map_client.txt)
      	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
      

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              Assignee:
              boq [Mojang] Bartosz Bok
              Reporter:
              Schortan [Mod] NeunEinser
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                Dates

                Created:
                Updated:
                Resolved: